Direct current motor assembly of constant-speed air conditioner outdoor unit and constant-speed air conditioner outdoor unit

Abstract

The invention discloses a direct current motor assembly of a constant-speed air conditioner outdoor unit and the constant-speed air conditioner outdoor unit. The direct current motor assembly of the constant-speed air conditioner outdoor unit comprises a direct current motor body; the input interface is used for accessing commercial power; the input end of the power supply module is connected with the input interface, and the power supply module is used for converting accessed commercial power into a direct-current power supply and outputting the direct-current power supply; the power supply input end of the driving module is connected with the output end of the power supply module, the output end of the driving module is connected with the direct current motor, and the driving module is used for converting the direct current power supply into a driving power supply and outputting the driving power supply to the direct current motor body. And the direct current motor body is driven to work at a preset rotating speed. The problem that a constant-speed air conditioner outdoor unit is easily affected by an input power source can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of constant-speed air conditioners, and in particular to a DC motor component of a constant-speed air conditioner outdoor unit and the constant-speed air conditioner outdoor unit. Background Art

[0002] Most of the current fixed-speed air conditioner outdoor models are not equipped with an electric control board, so the outdoor fan motors of fixed-speed models are basically AC asynchronous motors, and the zero and live wires of the AC power supply are directly connected to the AC motor terminals. However, the current technical solution of using AC asynchronous motors for fixed-speed outdoor motors has many disadvantages. The speed of the AC motor has no closed-loop control and is easily affected by the fluctuation of the mains power. At the same time, the instability of the mains power can easily cause the temperature rise of the motor to exceed the tolerance, causing the protector to operate and the machine to trip. In addition, due to the torque curve characteristics of the single-phase asynchronous AC motor, the high-efficiency speed range of the AC motor is very narrow, and the maximum efficiency is limited. Generally, the maximum efficiency of a 50HZ motor is 50-65%, and the maximum efficiency of a 60HZ motor is 40-55%. The maximum speed is affected by the slip rate of the AC motor and is generally set within 900rpm. Therefore, the overall capacity and energy efficiency are greatly affected by the input power and speed of the AC motor. Summary of the invention

[0003] The main purpose of the present invention is to provide a DC motor assembly for a constant-speed air conditioner outdoor unit, aiming to solve the problem that the constant-speed air conditioner outdoor unit is easily affected by the input power supply.

[0004] To achieve the above object, the DC motor assembly of the fixed speed air conditioner outdoor unit proposed by the present invention comprises:

[0005] DC motor body;

[0006] Input interface, used to access the mains power;

[0007] A power supply module, the input end of which is connected to the input interface, and the power supply module is used to convert the connected mains power into a DC power supply for output;

[0008] A driving module, wherein the power input end of the driving module is connected to the output end of the power module, and the output end of the driving module is connected to the DC motor. The driving module is used to convert the DC power supply into a driving power supply and then output it to the DC motor body to drive the DC motor body to operate at a predetermined speed.

[0009] Optionally, the driving module and the power supply module are integrated in the DC motor body.

[0010] Optionally, the DC motor body includes a housing and an end cover matched with the housing, and the end cover matches with the housing to form a receiving cavity;

[0011] The driving module and the power supply module are arranged on a side surface of the end cover close to the housing.

[0012] Optionally, the driving module further has a first power supply end and a second power supply end;

[0013] The first power supply output end of the power supply module is connected to the first power supply end of the driving module, and the second power supply output end of the power supply module is connected to the second power supply end of the driving module. The power supply module is also used to convert the connected AC power into a first power supply and output it from the first power supply output end, and convert the connected AC power into a second power supply and output it from the second power supply output end to power the driving module.

[0014] Optionally, the driving module includes:

[0015] A motor drive circuit, wherein the input end of the motor drive circuit is connected to the output end of the power module, and the motor drive circuit is used to convert the DC power supply into a drive power supply and then output it to the DC motor body, so as to drive the DC motor body to work at a predetermined speed;

[0016] A control circuit, wherein the control end of the control circuit is connected to the controlled end of the motor drive circuit, and the control circuit is used to control the motor drive circuit to convert the DC power supply into a drive power supply and output it to the DC motor, so as to drive the DC motor body to operate at a predetermined speed.

[0017] Optionally, the power module includes:

[0018] A rectifier circuit, the input end of which is connected to the input interface, and the rectifier circuit is used to convert the connected AC mains power into a DC power supply for output;

[0019] A switching power supply circuit, wherein the input end of the switching power supply circuit is connected to the output end of the rectifier circuit, the output end of the switching power supply circuit is connected to the power supply end of the motor drive circuit, and the switching power supply circuit is used to convert the DC power supply into a first power supply and then output it to power the motor drive circuit;

[0020] A voltage stabilizing circuit, wherein the input end of the voltage stabilizing circuit is connected to the output end of the switching power supply circuit, the output end of the voltage stabilizing circuit is connected to the power supply end of the control circuit, and the voltage stabilizing circuit is used to convert the first power supply into a second power supply and then output it to power the control circuit.

[0021] Optionally, the DC motor component of the fixed-speed air conditioner outdoor unit further includes:

[0022] A bus voltage sampling circuit, the bus voltage sampling circuit is electrically connected to the power module, and the bus voltage sampling circuit is used to detect the DC bus voltage and output a corresponding voltage detection signal to the drive module, so that the drive module drives the DC motor to work / stop working according to the voltage detection signal.

[0023] Optionally, the DC motor component of the fixed-speed air conditioner outdoor unit further includes:

[0024] A current sampling circuit is electrically connected to the driving module, and is used to detect the output current of the driving module and output a corresponding current detection signal to the driving module, so that the driving module drives the DC motor to work / stop working according to the current detection signal.

[0025] Optionally, the DC motor component of the fixed-speed air conditioner outdoor unit further includes:

[0026] A temperature sampling circuit is electrically connected to the driving module. The temperature sampling circuit is used to detect the operating temperature of the DC motor body and output a corresponding temperature detection signal to the driving module so that the driving module drives the DC motor to work / stop working according to the temperature detection signal.

[0027] The present invention further provides a constant-speed air-conditioning outdoor unit, which comprises the above-mentioned DC motor component of the constant-speed air-conditioning outdoor unit.

[0028] In the technical solution of the present invention, a DC motor is used to replace the AC motor in the existing air-conditioning outdoor unit, and the DC motor is driven to work at a predetermined speed, so that the external power supply fluctuation will not affect the operation of the motor at the set speed, thereby improving the stability of the fixed-speed air-conditioning outdoor unit. Moreover, since it is a DC motor body, the efficiency is completely equivalent to the efficiency of the variable-frequency motor or even higher, thereby greatly improving the efficiency of the motor. In addition, although the material cost of the power module and drive module of the newly designed fixed-speed DC motor is equivalent to or slightly higher than that of the AC motor, due to the significant improvement in motor efficiency, the decrease in input power is very obvious, which drives down the cost of related materials such as the evaporator, condenser and compressor, thereby greatly reducing the overall cost of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 It is a functional module schematic diagram of an embodiment of a DC motor assembly of a fixed speed air conditioner outdoor unit of the present invention;

[0031] Figure 2 It is a functional module schematic diagram of another embodiment of a DC motor assembly of a fixed speed air conditioner outdoor unit of the present invention;

[0032] Figure 3 It is a circuit structure diagram of an embodiment of a motor drive circuit of a fixed speed air conditioner outdoor unit of the present invention;

[0033] Figure 4 A schematic diagram of the circuit structure of an embodiment of a control circuit of an outdoor unit of a constant speed air conditioner according to the present invention;

[0034] Figure 5 It is a circuit structure diagram of an embodiment of a rectifier circuit of a fixed-speed air conditioner outdoor unit of the present invention;

[0035] Figure 6 It is a circuit structure diagram of an embodiment of a switching power supply circuit of a fixed-speed air conditioner outdoor unit of the present invention;

[0036] Figure 7 It is a circuit structure diagram of an embodiment of a voltage stabilizing circuit of a fixed speed air conditioner outdoor unit of the present invention;

[0037] Figure 8 It is a circuit structure diagram of an embodiment of a bus voltage sampling circuit of a fixed-speed air conditioner outdoor unit of the present invention;

[0038] Fig. 9 It is a circuit structure diagram of an embodiment of a current sampling circuit of a constant speed air conditioner outdoor unit of the present invention;

[0039] Fig.10 The figure is a circuit structure diagram of an embodiment of an overcurrent protection circuit for an outdoor unit of a constant speed air conditioner according to the present invention.

[0040] Description of Figure Numbers:

[0041] Label name Label name 10 Driver module 11 Motor drive circuit 20 Power Module 12 Control Circuit 30 Bus voltage sampling circuit 21 Rectification circuit 40 Current sampling circuit 22 Switching power supply circuit 50 Temperature sampling circuit 23 Voltage stabilization circuit

[0042] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] At present, most of the current fixed-speed air conditioner outdoor models are not equipped with an electric control board, so the outdoor fan motors of fixed-speed models are basically AC asynchronous motors, and the neutral and live wires of the AC power supply are directly connected to the AC motor terminals. However, the current technical solution of using AC asynchronous motors for the outdoor motors of fixed-speed machines has the following main disadvantages:

[0047] 1. Unstable speed and temperature rise --- The speed of the AC motor has no closed-loop control and is easily affected by the fluctuation of the mains power. At the same time, the instability of the mains power can easily cause the temperature rise of the motor to exceed the tolerance, causing the protector to operate and the machine to stop.

[0048] 2. Low efficiency - Due to the torque curve characteristics of single-phase asynchronous AC motors, the high-efficiency speed range of AC motors is very narrow, and the maximum efficiency is limited. Generally, the maximum efficiency of 50HZ motors is 50-65%, and the maximum efficiency of 60HZ motors is 40-55%. The maximum speed is affected by the slip rate of the AC motor and is generally set within 900rpm. Therefore, the overall energy efficiency is greatly affected by the input power and speed of the AC motor.

[0049] 3. High cost: In order to meet the energy efficiency requirements of fixed-speed air conditioners, especially in the Middle East, the number of evaporator rows and AC motor materials used in fixed-speed air conditioners are very large.

[0050] In order to solve the above problems, the present invention proposes a DC motor assembly for a constant speed air conditioner outdoor unit, referring to Figures 1 to 3 In one embodiment, the DC motor assembly of the fixed speed air conditioner outdoor unit includes:

[0051] DC motor body;

[0052] An input interface, used to connect to the mains to supply power to the DC motor body;

[0053] A power module 20, the input end of which is connected to the input interface, and the power module 20 is used to convert the connected mains power into a DC power supply for output;

[0054] A driving module 10, wherein the power input end of the driving module 10 is connected to the output end of the power module 20, and the output end of the driving module 10 is connected to the DC motor. The driving module 10 is used to convert the DC power supply into a driving power supply and then output it to the DC motor body to drive the DC motor body to operate at a predetermined speed.

[0055] In this embodiment, the DC motor can be a permanent magnet DC motor, a separately excited DC motor, a self-excited DC motor, or other DC motors, which are used to convert electrical energy into mechanical energy to drive the fan in the fixed speed air conditioner outdoor unit to rotate. The DC motor body can be composed of a housing, an end cover, a stator, a rotor, a rotating shaft, and other parts, wherein the housing and the end cover can be fixedly installed by means of screws, buckles, or slots, so as to form the outer shell of the motor and form a housing cavity inside, which is used to accommodate the stator, rotor, and rotating shaft of the motor. When the current passes through the rotor to generate a magnetic field and interacts with the magnetic field of the stator, a torque is generated to rotate the motor. By controlling the magnitude and direction of the rotor current, the speed and direction of the DC motor can be controlled. The drive module 10 can be composed of a motor drive circuit 11 and a control circuit 12 for controlling the motor drive circuit 11. The motor drive circuit 11 can convert the DC power output by the power module 20 into a drive power based on the control of the control circuit 12, and then output it to the DC motor body to drive the DC motor to work, so that the DC motor electrical energy is converted into mechanical energy to drive the fan in the fixed speed air conditioner outdoor unit to rotate. The power module 20 may be composed of a rectifier circuit 21, and the power module 20 may convert the connected AC mains power into a DC power supply and output it to the drive module 10. In addition, a corresponding DC-DC conversion circuit or an LDO voltage regulator circuit 23 or other power supply circuit may be provided in the power module 20 to convert the DC power supply into a power supply with a lower voltage to power the IPM module or MCU in the drive module 10.

[0056] It is worth noting that in this embodiment, the driving module 10 is used to drive the DC motor body to work at a predetermined speed, that is, the DC motor rotates at a predetermined speed, that is, it works at a constant speed, wherein the predetermined speed can be set according to the energy efficiency of the air conditioner or the needs of the user. It can be understood that setting the DC motor to work at a constant speed makes the speed of the DC motor not affected by the fluctuation of the external power supply, thereby improving the stability of the fixed speed air conditioner outdoor unit.

[0057] In the technical solution of the present invention, a DC motor is used to replace the AC motor in the existing air-conditioning outdoor unit, and the DC motor is driven to work at a predetermined speed, so that the external power supply fluctuation will not affect the operation of the motor at the set speed, thereby improving the stability of the fixed-speed air-conditioning outdoor unit. In addition, since it is a DC motor body, the efficiency is completely equivalent to the efficiency of the variable-frequency motor or even higher, thereby greatly improving the efficiency of the motor. In addition, although the material cost of the power module 20 and the drive module 10 of the newly designed fixed-speed DC motor is equivalent to or slightly higher than that of the AC motor, due to the significant improvement in motor efficiency, the decrease in input power is very obvious, which drives down the cost of related materials such as evaporators, condensers and compressors, thereby greatly reducing the overall cost of the whole machine.

[0058] Reference Figures 1 to 3 In one embodiment, the driving module 10 and the power module 20 are integrated into the DC motor body.

[0059] It is understandable that the outdoor fan motors in the existing fixed-speed air-conditioning outdoor units are basically AC asynchronous motors. The AC power supply neutral and live wires are directly connected to the AC motor terminals, and the AC mains directly provides driving power to drive the AC motor. Therefore, the existing fixed-speed air-conditioning outdoor units are not equipped with electronic control boards, which also makes the speed of the AC motor have no closed-loop control and is easily affected by the fluctuation of the mains.

[0060] In this embodiment, if the AC motor is replaced by a DC motor, an electric control part needs to be set to control the speed of the DC motor so that the DC motor rotates at a constant speed. Therefore, the drive module 10 and the power module 20 can be integrated into the DC motor body, that is, there is no electric control part outside the DC motor, so that the fixed speed air conditioner outdoor unit does not need to be provided with an electric control board. It can be understood that when the drive module 10 and the power module 20 are integrated inside the DC motor, the input terminal of the DC motor can be connected to the mains as an input interface, and then the drive module 10 and the power module 20 inside the motor convert the mains into a driving power supply to drive the motor to work. In this way, when the power module 20, the drive module 10 and the motor body are integrated inside the motor, the direct external power supply zero and live wire can be stably and efficiently operated at the set speed, which can achieve the same energy efficiency and speed of the variable frequency DC motor, and can also achieve the effect of power-on operation without external electric control, greatly improving the energy efficiency and comprehensive cost of the fixed speed model and product competitiveness. In addition, the AC motor used in the existing fixed-speed air conditioner outdoor unit is more prone to generating double-frequency noise and electromagnetic noise problems due to the harmonic interference of the mains power and the limitations of its own electromagnetic solution, especially the 60HZ model. The present invention replaces the AC motor with a DC motor, and integrates the power module 20 and the drive module 10 in the DC motor, which can reduce interference such as harmonics of the mains power, especially the inherent peak noise such as the double frequency of the AC motor can be completely solved.

[0061] Optionally, the DC motor body includes a housing and an end cover matched with the housing, and the end cover matches with the housing to form a receiving cavity;

[0062] The driving module 10 and the power module 20 are disposed on a surface of one side of the end cover close to the housing.

[0063] In one embodiment, the housing of the DC motor can be divided into two parts: a housing and an end cover. The housing and the end cover can be fixedly installed by means of screws, buckles or slots, so as to form the housing of the motor and form a housing cavity inside for accommodating the stator, rotor and shaft of the motor. The drive module 10 and the power module 20 are arranged on the side surface of the end cover close to the housing, that is, on the inner surface of the end cover. In this way, the power module 20 and the drive module 10 are arranged in the motor housing, so that the motor can be directly connected to the zero and live wires of the power supply to run stably and efficiently at the set speed, which can achieve the same energy efficiency and speed of the variable frequency DC motor, and can also achieve the effect of power-on operation without external electronic control, greatly improving the energy efficiency and comprehensive cost of the fixed speed model and product competitiveness. In addition, the AC motor used in the existing fixed-speed air conditioner outdoor unit is more prone to generating double-frequency noise and electromagnetic noise problems due to the harmonic interference of the mains power and the limitations of its own electromagnetic solution, especially the 60HZ model. The present invention replaces the AC motor with a DC motor, and integrates the power module 20 and the drive module 10 in the DC motor, which can reduce interference such as harmonics of the mains power, especially the inherent peak noise such as the double frequency of the AC motor can be completely solved.

[0064] Reference Figures 1 to 3 In one embodiment, the driving module 10 further has a first power supply terminal and a second power supply terminal;

[0065] The first power supply output end of the power supply module 20 is connected to the first power supply end of the driving module 10, and the second power supply output end of the power supply module 20 is connected to the second power supply end of the driving module 10. The power supply module 20 is also used to convert the connected mains power into a first power supply and output it from the first power supply output end, and to convert the connected mains power into a second power supply and output it from the second power supply output end, so as to power the driving module 10.

[0066] In this embodiment, the power module 20 provides a DC power supply to the driving module 10, and is also used to provide a first power supply and a second power supply to the driving module 10. The power module 20 may be composed of a rectifier circuit 21, a DC-DC conversion circuit, and a voltage stabilizing circuit 23, etc., wherein the rectifier circuit 21 is used to provide a DC power supply to the driving module 10, so that the inverter part in the driving module 10 converts the DC power supply into a driving power supply to drive the motor to work, and the DC-DC conversion circuit and the voltage stabilizing circuit 23 are used to convert the DC power supply into a first power supply and a second power supply to provide working power to the IPM module or MCU and other parts in the driving module 10, so that the driving module 10 can drive the motor to work.

[0067] Reference Figures 1 to 3 In one embodiment, the driving module 10 includes:

[0068] A motor drive circuit 11, wherein the input end of the motor drive circuit 11 is connected to the output end of the power module 20, and the motor drive circuit 11 is used to convert the DC power supply into a drive power supply and then output it to the DC motor body, so as to drive the DC motor body to work at a predetermined speed;

[0069] A control circuit 12, wherein the control end of the control circuit 12 is connected to the controlled end of the motor drive circuit 11, and the control circuit 12 is used to control the motor drive circuit 11 to convert the DC power supply into a drive power supply and then output it to the DC motor, so as to drive the DC motor body to operate at a predetermined speed.

[0070] In this embodiment, the motor drive circuit 11 can be composed of an IPM module or an inverter circuit, etc., which is used to convert the DC power supply into a drive power supply and then output it to the DC motor to drive the motor to work. The control circuit 12 can be implemented by a microprocessor such as CPLD, FPGA, MCU, etc. The control circuit 12 is used to output a corresponding control signal to control the motor drive circuit 11 to work. It can be understood that the control circuit 12 can output a certain PWM signal according to actual application requirements, thereby controlling the motor drive circuit 11 to output a fixed drive power supply, thereby driving the motor to work at a predetermined speed. Figure 3 and Figure 4 ,in, Figure 3 This is a circuit structure diagram of an embodiment of a motor driving circuit. The motor driving circuit 11 is composed of an IPM chip, which is used to convert a DC power supply into a driving power supply and then output it to a DC motor to drive the motor to work. Figure 4 1 is a schematic diagram of a circuit structure of an embodiment of a control circuit 12 . The control circuit 12 is composed of an MCU and peripheral circuits, and is used to output corresponding PWM control signals to control the operation of the motor drive circuit 11 .

[0071] In one embodiment, the power module 20 includes:

[0072] A rectifier circuit 21, the input end of which is connected to the input interface, and the rectifier circuit 21 is used to convert the connected AC mains power into a DC power supply for output;

[0073] A switching power supply circuit 22, wherein the input end of the switching power supply circuit 22 is connected to the output end of the rectifier circuit 21, and the output end of the switching power supply circuit 22 is connected to the power supply end of the motor drive circuit 11, and the switching power supply circuit 22 is used to convert the DC power supply into a first power supply and then output it to power the motor drive circuit 11;

[0074] A voltage stabilizing circuit 23, wherein the input end of the voltage stabilizing circuit 23 is connected to the output end of the switching power supply circuit 22, and the output end of the voltage stabilizing circuit 23 is connected to the power supply end of the control circuit 12, and the voltage stabilizing circuit 23 is used to convert the first power supply into a second power supply and then output it to power the control circuit 12.

[0075] In this embodiment, the rectifier circuit 21 is used to rectify the AC mains power into a DC power supply, and output it to the motor drive circuit 11 and the switching power supply circuit 22. The switching power supply circuit 22 can be implemented by using a DC-DC conversion circuit and a buck circuit, etc. The switching power supply circuit 22 can convert the DC power output by the rectifier circuit 21 into a first power supply to power the motor drive circuit 11 of the drive module 10. The voltage stabilizing circuit 23 can be implemented by using an LDO chip, etc., and is used to convert the first power supply output by the switching power supply circuit 22 into a second power supply to power the control circuit 12 of the drive module 10. Figures 5 to 7 ,in, Figure 5 This is a circuit structure diagram of an embodiment of a rectifier circuit. The rectifier circuit 21 is composed of discrete devices such as resistors, capacitors, and transformers, and is used to rectify the connected AC220V mains power into a DC310V voltage and output it to the switching power supply circuit 22. Figure 6 This is a circuit structure diagram of an embodiment of a switching power supply circuit. The switching power supply circuit 22 is composed of discrete devices such as switching power supply chips, capacitors, resistors and diodes, and is used to convert the DC 310V voltage output by the rectifier circuit 21 into a DC 15V regulated output to provide a first power supply for the motor drive circuit 11 and the voltage stabilizing circuit 23 of the drive module 10. Figure 7 This is a circuit structure diagram of an embodiment of a voltage stabilizing circuit. The voltage stabilizing circuit 23 is implemented using an LDO voltage stabilizing chip to convert the DC 15V voltage output by the switching power supply circuit 22 into a 3.3V voltage to power the control circuit 12 of the driving module 10.

[0076] Reference Figures 1 to 3 In one embodiment, the DC motor assembly of the fixed speed air conditioner outdoor unit further includes:

[0077] The bus voltage sampling circuit 30 is electrically connected to the power module 20. The bus voltage sampling circuit 30 is used to detect the DC bus voltage and output a corresponding voltage detection signal to the drive module 10, so that the drive module 10 drives the DC motor to work / stop working according to the voltage detection signal.

[0078] In the present embodiment, the bus voltage sampling circuit 30 can select a resistor divider or a series resistor to realize voltage acquisition. The bus voltage sampling circuit 30 can collect the DC bus voltage and output the corresponding voltage detection signal to the control circuit 12 in the driving module 10, so that the driving module 10 can determine the bus voltage, thereby driving the DC motor to work or stop working according to the bus voltage to achieve functions such as overvoltage protection or undervoltage protection. For example, when the driving module 10 determines through the voltage detection signal that the bus voltage is greater than 420V and lasts for two milliseconds, the DC motor is driven to stop working to achieve overvoltage protection, or when the driving module 10 determines through the voltage detection signal that the bus voltage is less than 100V and lasts for two milliseconds, the DC motor is driven to stop working to achieve undervoltage protection. Refer to Figure 8 , Figure 8 This is a circuit structure diagram of an embodiment of a bus voltage sampling circuit. The bus voltage sampling circuit 30 uses resistor voltage division to realize voltage acquisition. After the bus voltage sampling circuit is divided by resistors, the corresponding voltage detection signal is output to the control circuit 12 in the drive module 10, so that the drive module 10 can determine the bus voltage, thereby driving the DC motor to work or stop working according to the bus voltage, so as to realize functions such as overvoltage protection or undervoltage protection.

[0079] Reference Figures 1 to 3 In one embodiment, the DC motor assembly of the fixed speed air conditioner outdoor unit further includes:

[0080] A current sampling circuit 40 is electrically connected to the driving module 10. The current sampling circuit 40 is used to detect the output current of the driving module 10 and output a corresponding current detection signal to the driving module 10, so that the driving module 10 drives the DC motor to work / stop working according to the current detection signal.

[0081] In this embodiment, the current sampling circuit 40 can use a current sensor or the like to realize current collection. The current sampling circuit 40 can collect the output current of the driving module 10 and output the corresponding current detection signal to the control circuit 12 in the driving module 10, so that the driving module 10 can determine the magnitude of the output current, thereby driving the DC motor to work or stop working according to the magnitude of the output current, so as to realize functions such as current limiting protection or overcurrent protection. For example, when the driving module 10 determines through the current detection signal that the output current is greater than 1.04A and lasts for 10 milliseconds, the DC motor is driven to stop working to realize overcurrent protection. Fig. 9 and Fig.10 , Fig. 9 is a circuit structure diagram of an embodiment of a current sampling circuit, Fig.10 This is a circuit structure diagram of an embodiment of an overcurrent protection circuit. The current sampling circuit 40 uses a resistor divider to collect voltage, and determines the corresponding current size through the collected voltage size to achieve current collection, and through the overcurrent protection circuit, drives the DC motor to work or stop working according to the size of the output current to achieve current limiting protection or overcurrent protection and other functions.

[0082] Reference Figure 1 and Figure 2 In one embodiment, the DC motor assembly of the fixed speed air conditioner outdoor unit further includes:

[0083] The temperature sampling circuit 50 is electrically connected to the driving module 10. The temperature sampling circuit 50 is used to detect the operating temperature of the DC motor body and output a corresponding temperature detection signal to the driving module 10, so that the driving module 10 drives the DC motor to work / stop working according to the temperature detection signal.

[0084] In this embodiment, the temperature sampling circuit 50 can select a temperature sensor or the like to realize temperature acquisition. The temperature sampling circuit 50 can acquire the working temperature of the DC motor body and output a corresponding temperature detection signal to the control circuit 12 in the driving module 10, so that the driving module 10 can determine the magnitude of the working temperature, thereby driving the DC motor to work or stop working according to the magnitude of the working temperature, so as to realize functions such as temperature protection. For example, when the driving module 10 determines through the current detection signal that the working temperature of the DC motor body is greater than 105°C and lasts for 1 second, the DC motor is driven to stop working to realize over-temperature protection.

[0085] The present invention also proposes a constant-speed air-conditioning outdoor unit, which includes the above-mentioned DC motor assembly of the constant-speed air-conditioning outdoor unit. The specific structure of the DC motor assembly of the constant-speed air-conditioning outdoor unit refers to the above-mentioned embodiment. Since the constant-speed air-conditioning outdoor unit adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0086] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A DC motor assembly for a constant speed air conditioner outdoor unit, characterized in that: include: DC motor body; Input interface, used to access the mains power; A power supply module, the input end of which is connected to the input interface, and the power supply module is used to convert the connected mains power into a DC power supply for output; A driving module, wherein the power input end of the driving module is connected to the output end of the power module, and the output end of the driving module is connected to the DC motor. The driving module is used to convert the DC power supply into a driving power supply and then output it to the DC motor body to drive the DC motor body to operate at a predetermined speed.

2. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, characterized in that: The driving module and the power supply module are integrated in the DC motor body.

3. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 2, characterized in that: The DC motor body comprises a housing and an end cover matched with the housing, wherein the end cover matches with the housing to form a receiving cavity; The driving module and the power supply module are arranged on a side surface of the end cover close to the housing.

4. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, characterized in that: The driving module also has a first power supply end and a second power supply end; The first power supply output end of the power supply module is connected to the first power supply end of the driving module, and the second power supply output end of the power supply module is connected to the second power supply end of the driving module. The power supply module is also used to convert the connected AC power into a first power supply and output it from the first power supply output end, and convert the connected AC power into a second power supply and output it from the second power supply output end to power the driving module.

5. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, characterized in that: The driving module comprises: A motor drive circuit, wherein the input end of the motor drive circuit is connected to the output end of the power module, and the motor drive circuit is used to convert the DC power supply into a drive power supply and then output it to the DC motor body, so as to drive the DC motor body to work at a predetermined speed; A control circuit, wherein the control end of the control circuit is connected to the controlled end of the motor drive circuit, and the control circuit is used to control the motor drive circuit to convert the DC power supply into a drive power supply and output it to the DC motor, so as to drive the DC motor body to operate at a predetermined speed.

6. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 5, characterized in that: The power module comprises: A rectifier circuit, the input end of which is connected to the input interface, and the rectifier circuit is used to convert the connected AC mains power into a DC power supply for output; A switching power supply circuit, wherein the input end of the switching power supply circuit is connected to the output end of the rectifier circuit, the output end of the switching power supply circuit is connected to the power supply end of the motor drive circuit, and the switching power supply circuit is used to convert the DC power supply into a first power supply and then output it to power the motor drive circuit; A voltage stabilizing circuit, wherein the input end of the voltage stabilizing circuit is connected to the output end of the switching power supply circuit, the output end of the voltage stabilizing circuit is connected to the power supply end of the control circuit, and the voltage stabilizing circuit is used to convert the first power supply into a second power supply and then output it to power the control circuit.

7. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, characterized in that: The DC motor assembly of the fixed speed air conditioner outdoor unit also includes: A bus voltage sampling circuit, the bus voltage sampling circuit is electrically connected to the power module, and the bus voltage sampling circuit is used to detect the DC bus voltage and output a corresponding voltage detection signal to the drive module, so that the drive module drives the DC motor to work / stop working according to the voltage detection signal.

8. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, characterized in that: The DC motor assembly of the fixed speed air conditioner outdoor unit also includes: A current sampling circuit is electrically connected to the driving module, and is used to detect the output current of the driving module and output a corresponding current detection signal to the driving module, so that the driving module drives the DC motor to work / stop working according to the current detection signal.

9. The DC motor assembly of the fixed speed air conditioner outdoor unit according to claim 1, characterized in that: The DC motor assembly of the fixed speed air conditioner outdoor unit also includes: A temperature sampling circuit is electrically connected to the driving module. The temperature sampling circuit is used to detect the operating temperature of the DC motor body and output a corresponding temperature detection signal to the driving module so that the driving module drives the DC motor to work / stop working according to the temperature detection signal.

10. A constant speed air conditioner outdoor unit, characterized in that: A DC motor assembly for a constant speed air conditioner outdoor unit comprising the DC motor assembly as described in any one of claims 1 to 9.

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